Actually, my Gallardo is not a real gas expense for me..at least not when I compare it to going out on my boat with friends for a day of scuba or freediving, or just "cocktail cruising" :-)
Half a day is about half a tank, the way it tends to work out, and that is around $350 each time...every saturday and sunday, weather permitting ( diving is not as much fun with waves over 5 feet--the boat ride part of it).
So the Gallardo seems more like an economy toy at the moment :-)
Dan